I've been hammering away at this one for months, and just can't get anywhere. Basically, it all goes pretty well up until the NATO counterattack, at which point waves of Leopard 2s and Marders swarm me down the road from the north. Now, normally I wouldn't bother you fine folk and I'd just use Youtube, but alas, Youtube is banned in my country of residence (and yes, it sucks). Does anyone have any suggestions to finally defeat Mission 6? Any hints/tips would be very much appreciated!

Also if you have problems holding your ground, replay mission 5 and rescue more forces. Use the time limit up to the max, your last units should be moving around the 34 minute mark and you can rescue de facto everything with a solid defense.